Date: Mon, 31 Jan 2000 05:50:03 -0800 (PST) From: Terry Kennedy <terry@tmk.com> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/10872: Panic in soreceive() due to NULL mbuf pointer Message-ID: <200001311350.FAA79582@freefall.freebsd.org>
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The following reply was made to PR kern/10872; it has been noted by GNATS.
From: Terry Kennedy <terry@tmk.com>
To: freebsd-gnats-submit@freebsd.org
Cc: bmilekic@dsuper.net
Subject: Re: kern/10872: Panic in soreceive() due to NULL mbuf pointer
Date: Mon, 31 Jan 2000 08:35:05 -0500 (EST)
Here's some more info on one of these crashes. From the attached, it
looks like it's gone off into the weeds with a corrupted mbuf chain.
All of the examine-able data which should be addresses is ASCII text
instead... Or am I missing something?
(kgdb) up 25
#25 0xc01c6187 in tulip_rx_intr (sc=0xc5e4d800) at ../../pci/if_de.c:3649
3649 MCLGET(m0, M_DONTWAIT);
(kgdb) list
3644 MGETHDR(m0, M_DONTWAIT, MT_DATA);
3645 if (m0 != NULL) {
3646 #if defined(TULIP_COPY_RXDATA)
3647 if (!accept || total_len >= MHLEN) {
3648 #endif
3649 MCLGET(m0, M_DONTWAIT);
3650 if ((m0->m_flags & M_EXT) == 0) {
3651 m_freem(m0);
3652 m0 = NULL;
3653 }
(kgdb) print *m0
$1 = {m_hdr = {mh_next = 0x4926235d, mh_nextpkt = 0x3f5c323b,
mh_data = 0x33225e3fcannot read proc at 0
(kgdb) print m0
$2 = (struct mbuf *) 0xc0060280
(kgdb) printf "%s", m0
]#&I;2\??^"3?[Q#6@TC&`X&DR
MQHX96+!O"Q?D'XQTQ?447PC\0VQI?"GTVKQ;T%^\0'TT`Q??O?XOZ`4?XP=4
MC-G'9W9FC;(**%*BVA:4`I*J!K,OV'ZU>Y0]E)/%!HR)\1,K!)["=VQ9+RBY
M$5%N6\U6C0DZ*+J(5?C>;47<4%^)_&.)O%WM_EM1#YVZAZK"YK;4@I-6)]T&
M=AYT2-.I?E/+<\MR7*EZ1]T[;^SK_5%N[HQFB-L`J.!<HL)PFPQ4`FBL;__[
[snip]
(part of a uuencoded news article)
Terry Kennedy http://www.tmk.com
terry@tmk.com Jersey City, NJ USA
+1 201 451 4554 (voice) +1 201 451 0900 (FAX)
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